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3. Vermedien von Ratterschwingungen durch periodische Drehzahlanderung;Stoferle;Werkstatt und Betrieb,1972
4. Stability analysis of cutting under varying spindle speed;Inamura;Ann. CIRP,1974
5. Active suppression of chatter by programmed variation of spindle speed;Takemura;Ann. CIRP,1974